Due to very bizarre circumstances, the human boy, Suzuki Iruma, ends up in the netherworld. He is keeping the fact that he is human a secret and attends the Demon School Babyls. Because he is human, he cannot use magic so he had been using the Gluttonous Feeder Ring to get by in school. But then one day, the ring started to speak! Why, though? Iruma then meets the incarnation of the ring who calls themselves Alicred, AKA Ali-san.
The Gluttonous Feeder Ring is just a 
magical apparatus that stores magical power.
.الخاتم الشّره هو مجرّد جهاز سحريّ يخزّن القوّة السّحريّة
Der Ring des abartigen Fressens
ist ein Dämonen-Item mit dämonischer Kraft.
El Anillo Voraz es un instrumento
que acumula poder mágico.
El Anillo Voraz es un instrumento
que acumula poder mágico.
Ce n’est qu’un accessoire démoniaque
pour stocker la magie.
L'Anello Divoratore è solo un apparato magico 
che immagazzina potere.
O anel glutão é apenas um aparato
mágico que armazena poder mágico.
Кольцо «Пожиратель» — это артефакт,
который накапливает ману.